Isaksen, Ketil. 2001. Past and Present Ground Thermal Regime, Distribution and Creep of Permafrost Case Studies in Svalbard, Sweden and Norway. Series of dissertations submitted to the Faculty of Mathematics and Natural Sciences, University of Oslo, No. 144. UniPub Forlag, Oslo. ISSN 1501-7710.

"Isaksen, Ketil. 2001. Past and Present Ground Thermal Regime, Distribution and Creep of Permafrost Case Studies in Svalbard, Sweden and Norway. Series of dissertations submitted to the Faculty of Mathematics and Natural Sciences, University of Oslo, No. 144. UniPub Forlag, Oslo. ISSN 1501-7710.." Norsk Geografisk Tidsskrift - Norwegian Journal of Geography, 55(4), pp. 274–275